In this episode, we ask whether MPs who switch parties should be forced to face a by-election – and what this month’s spate of defections says about representation, party power and voter consent. We also unpick a dizzying week in British and global politics as “hurricane Trump” batters the post-war order, testing the UK-US alliance and raising awkward questions about NATO, defence spending and procurement. Plus: the Lords’ push for an under-16s social media ban, Chagos ping-pong, and why is the bill to remove hereditary Peers from the House of Lords stalled?

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With Westminster watching Washington’s every swerve, we explore why Keir Starmer’s most outspoken pushback on tariffs and Greenland matters – and why making big foreign-policy statements outside the Commons still rankles.

In the Lords, a proposed ban on social media for under-16s forces the government into damage-limitation. Is the government’s promised consultation a serious route to action, or simply a way of kicking a difficult issue into the long grass? We look at how enforceable such a ban would be, how it fits with the existing Online Safety Act, and the political and constitutional tension of tightening access at 16 while simultaneously debating votes at 16.

We then turn to a growing list of legislative headaches: the Hillsborough Law stalling again amid disputes over national security carve-outs; renewed procedural drama over the Chagos Islands Bill, how the financial privilege of the House of Commons blocks Lords amendments, and what options Peers have left.  We also ask why the bill to remove he remaining hereditary peers appears to be stuck in a curious parliamentary holding pattern.

Finally, we focus on party switching, the e-petition calling for automatic by-elections for defecting MPs, and whether such a rule would enhance democratic accountability or simply hand party machines a powerful new weapon against dissent. As we were recording, news broke of an actual by-election, with Andrew Gwynne MP announcing his resignation on health grounds – a vacancy that could trigger a contest with significant implications for Labour’s internal politics and Sir Keir Starmer’s leadership.

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Parliament Matters is a Hansard Society production supported by the Joseph Rowntree Charitable Trust.

Presenters: Mark D’Arcy and Ruth Fox

Producer: Richard Townsend

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